If your footage is already on a HDD why would you need to go through Log&Transfer? Why not simply drag the file strait into the media bin? What am I missing?
I don’t know if this helps, but you can set the on-screen display to also display through the composite and SDI outputs on the camera. Obviously, this would require an external recorder of some sort.
If you double-click on your first audio channel in the Final Cut Pro timeline and look at the viewer, you’ll see a pan setting which is most likely set in the center. This is why you hear your mono channel in both sides of your headphones.